Process of roasting and sintering pulverulent ores having a high sulphur content



May 31, 1932. KLENCKE 1,861,122

PROCESS OF ROASTING AND SINTERING PULVERULENT ORES HAVING A HIGH SULPHUR CONTENT Filed Sept. 16, 1930 tion box. t

V vention the igniting furnace is hred with Patented May 31, 1932 PATENT OFFICE- rrnzsxnmvcxn, or rnmxroa'r-on-rnn-mam, GERMANY, nssrcivon ro mnnrcsn LURGI CORPORATION, OF. NEW YORK,

N. Y., a oonrona'rrou or vnw YORK raocnss or nons'rnvcnivn srmn mvc PUL'VERULEN'I. cans name ii men 7 SULPI-IUB.CNTENT Application filed September 16,

invention relates to a process of r0 ast ing and sintering pulverulent ores having a high sulphur content.

More particularly the invention relates tov a blast roasting or sintering process.

In ore treating processes of the so-called Dwight-Lloyd type see General Metallurgy by Hoffman, 1913 edition, page 430, the ore to lfie gggsgtela'ld and sintered lils depcgsitfid from a co 0 ronto a ets w m are carlried succes i zly unde the ore feeding hopper and an igniting furnace and over a sin;- ,tion box. The igniting furnace ordinarily 1s fired with oil or gas and serves to ignite the 1 ore which then continues to burn in the draft 7 of air passing through it created by the suc- In accordance with the present inpowdered ore of high sulphur content, which is capable of burning whereby not only is the ore on the pallets ignited, but the powdered ore used as fuel in the igniting furnace isroasted and sintered. A burner of the type V commonly used for burning powdered coal may be used for feeding the powdered ore to the igniting furnace.

In many cases pulverulent ore alone will not suflice as fuel and it will be necesary to mix it with a certain proportion of other m fuels such as for example, gas, coal-dust or the like. I

' When employing an ore-fired furnace for the ignition,,in accordance with the present invention, the burning ore is 'blown on to the as ore layeron the grate which acts as a hlter and is roasted and sintered together with said 1:. er. Y I 'lhe fuel which-is employed for the ignition furnace in carrying out the invention may comprise pulverulent ores having a high sulphur content such as for example pyrites and zinc blende such as obtained from flotation pr The firing with glnverulent ore has the advantage that the g is utilized for roasting the highl sulphurous ores so that the ores need not, as 'therto usual, be preliminarily roasted and brought into a crumbly form.

The invention will be described further with reference to the accompanying drawing ore charge layer 7.

,i nite the charge layer and 1930, Serial No. 482,377, and in Germany September 28 1929.

in which the single figure is a schematic representation ofone form of apparatus adapted for the carrying out of the process of the invention. I V

- In the drawing, the numeral 1 indicates the grate ofa sintering furnace of the Dwight-Lloydtype. 2' is a feed bunker for laying on the grate 1 a grate-covering charge 6, while 3 is a feed bunker for laying the actual orc charge 7 to be sintered on the protective layer 6. 4 represents an open-bottomed igniting furnace, or combustion chamber,uof suitable shape and size and so positioned with respect to the grate and charge of the sintering furnace as to bring its solid and/or gaseous contents into'direct contact with the charge -7. 5 diagrammatically represents a suitable nozzle for injecting a combustion-supportin gas-pulverulent ore mixture with or without added fuel into the ohamber l from any suitable source. 8 indicates the customary suction boxes of apparatus of this type. 9 represents a layer of sintered pulverulent ore superposed on the v The process proceeds as follows: During the passage of the-grate l'below the feed bunkers 2 and 3 a thin layer ofprotective covering 6- for the grate is applied to the latter, as by shaking, and a layer 7 (of'ordinary thickness) of the ore to be sintered is applied thereon. The ignition offthis ore layer is accomplished under the chamber or furnace 4. In the latter, a mixture of pulverulent ore of high sulphur content and a gaseous supporter of combustion, e. g., air, withor without an addition of a supplemental fuel, is caused to burn, after the manner of ignition customary in the burning of coal dust. The burning pulverulent oreand the resulting gases, actuated by the suction of suction'boxes 8, are sucked down onto the charge layer 7 wherein or whereon the solids 9 are retained as on a filter. This burning upper layer serves to is roasted and smtered with-the latter. I

v I claim:-

1. In processes of blast roasting sulphide ores involving depositing a layer of the ore on a grate, igniting the surface of the deposited layer of ore and continuing the sintering of the ore b passing a current of air through the deposited layer, the step which consists in igniting the surface of the deposited layer of ore by burning powdered sulfid ore suspended in a blast of air in contact with said layer of ore whereby said powdered ore is deposited on said layer of ore and roasted and sintered.

2. Process of blast roasting sulphide ores as defined in claim 1, in which a powdered carbonaceous fuel is mixed with the powdered sulfid ore used for igniting the layer of ore.

In testimony whereof, I aflix my signature.

HANS KLENOKE. 

